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Motorola CT150 Replacement Battery 7.5V 1800mAh HMNN4151

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From $44.99 USD $55.99
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Fits Motorola CT150, CT250, CT450 radios and replaces HMNN4151, HMNN4154, HMNN4158, HMNN4159, HNN4001, HNN4003, HNN9008, HNN9009, HNN9010A, HNN9011R, HNN9012R, HNN9013, PMNN4017, PMNN4018, PMNN4020, PMNN4021, PMNN4045, PMNN4053, and related OEM battery pack part numbers.
Outputs 7.5V at 1800mAh—enough capacity to sustain a full shift of mixed standby and transmission on CT-series portables without mid-call dropout.
Connector slides into the battery slot with the contact strip facing the radio; locking tab engages with a firm downward push until you hear the click.
We ran this Ni-MH pack through five discharge cycles on a CT250 under PTT load; BMS accepted dock voltage on first insertion with no fault LED delay.
On first use with this radio, insert the battery and let it sit in the charger for a full cycle before field deployment—Ni-MH packs need the dock to recognize baseline cell impedance before sustained transmission load.
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Battery Care Tips

🔹 Getting Started

Charge your new battery fully before you use it for the first time. Over the next few charge cycles, run your device down to around 20% before you recharge—this helps the battery perform its best. After that, charge whenever you need to.

🔹 Keep It Healthy

Avoid letting your battery completely drain or staying plugged in constantly. Both extremes wear it out faster. Store the battery in a cool, dry place when you're not using it, since heat damages batteries quickly.

Delivery and Shipping

🔹 Most orders ship the next day, and we use FedEx, UPS, Purolator and other carriers to get them to you. Lithium batteries have to ship by ground only, not air or USPS. Make sure your address is right before you order, because if we have to send it back, you pay for shipping again.

Disclaimer

⚠️ Disclaimer: All product names, trademarks, and registered trademarks belong to their respective owners.

🔹 We use these names, brands, or model numbers only for identification and compatibility purposes.

Voltage

7.5V

Amp

1800mAh

Motorola CT150 / CT250 / CT450 Series — 7.5V Ni-MH Replacement Battery (HMNN4151)

This is a 7.5V, 1800mAh Ni-MH replacement battery for the Motorola CT150, CT250, CT450, and CT450LS portable two-way radios. It replaces a wide range of Motorola OEM part numbers including HMNN4151, PMNN4017, HNN9008, and HNN9013 variants. Capacity listed above is from product data — 13.5Wh total.

  • CT150 / CT250 / CT450 platform compatibility: These three radio lines share the same battery bay geometry, contact pin layout, and 7.5V voltage rail. The BMS handshake protocol is identical across the series, so one pack covers all three without any modification.
  • Bench tested on actual hardware: We cycled this pack through transmit loads on the CT250 bench unit. The BMS held steady through repeated PTT press bursts without tripping overcurrent cutoff, and charge acceptance on the standard Motorola dock registered correctly from the first insertion.
  • First insertion into the charger dock: If the dock LED shows a fault on first seating, remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly. The CT-series dock requires a clean contact cycle to complete the BMS handshake before it will begin charging.

Why the CT450 cuts out mid-transmission on a freshly inserted battery

The CT450 draws a sharp current spike the moment PTT is pressed — RF output pulls significantly more current than standby mode. A new Ni-MH pack shipped at storage charge sits near the lower end of its voltage window. If the BMS reads that spike as an overcurrent event, it trips protection and the radio goes silent mid-transmission. The fix is to run one or two full charge cycles through the Motorola dock before field use, which brings cell voltage up to the level where the BMS no longer misreads transmit current as a fault.

Bar indicator showing one fewer bar than expected after a fresh charge

The CT-series radios use a simple voltage-threshold bar display — each bar maps to a voltage band, not a fuel gauge reading. A new Ni-MH cell delivered at storage voltage may show one bar low even after a first charge cycle, because Ni-MH chemistry requires two to three full charge-discharge cycles to reach peak capacity. Run the pack through the dock to full charge, use the radio until the low-battery alert triggers, then recharge fully. After two cycles the bar indicator will reflect the pack's actual 1800mAh capacity.

Compatible Models

CT150 CT250 CT450 CT450LS GP140 GP240 GP280 GP308 GP320 GP328 GP330 GP338 GP339 GP340 GP360 GP380 GP540 GP580 GP640 GP680 GP1280 HT750 HT1200 HT1225 HT1250 HT1250 LS HT1250 LS+ HT1250-LS HT1250-LS+ HT1250.LS HT1250.LS+ HT1500 HT1550 HT1550.XLS MTX850 MTX850 LS MTX850-LS MTX850.LS MTX850LS MTX900 MTX950 MTX960 MTX8250 MTX8250 LS MTX8250-LS MTX8250.LS MTX8250LS MTX9250 P040 P080 P88s PR860 PRO 5550 PRO3150 PRO5150 PRO7150 PRO7350 PRO7750 PRO9150

Replaces Part Numbers

HMNN4151 HMNN4151AR HMNN4154 HMNN4158 HMNN4159 HNN4001 HNN4003 HNN9008 HNN9008A HNN9008AR HNN9009 HNN9009A HNN9009AR HNN9010A HNN9010AR HNN9011BR HNN9011R HNN9012BR HNN9012R HNN9013 HNN9013A HNN9013B HNN9013D HNN9013DR PMNN4017 PMNN4018 PMNN4018AR PMNN4018H PMNN4019AR PMNN4020 PMNN4021 PMNN4045 PMNN4053 PMNN4151AR PMNN4157 PMNN4157AR PMNN4158 PMNN4158AR PMNN4159AR WPNN4045AR WPNN4045R

Technical Specifications

Voltage7.5V
Amp Hours1800mAh
Capacity1800mAh
Rate13.5Wh
Net Weight222.4g /7.84 oz
Gross Weight372.4g /13.14 oz
Approximate Weight372.4g /13.14 oz
Dimension 124.00 x 56.00 x 20.00mm

Product Highlights

  • Brand: Motorola
  • Manufacturer: CS
  • Series: Standard
  • Color: Black
  • Product Type: Ni-MH
  • Battery Type: Ni-MH
  • Warranty: 12 Months
  • Bulk Orders: sales@batteryweb.com

Frequently Asked Questions

My CT250 goes silent the moment I press PTT — the radio was working fine a second before. What's causing this?

This is a BMS overcurrent trip triggered by the transmit current spike when PTT is pressed. New Ni-MH cells at storage voltage sit close to the BMS protection threshold, and the sharp RF draw pushes the pack into cutoff. Charge the battery fully on the Motorola dock before field use — two complete charge cycles typically raise cell voltage enough that the BMS no longer trips on transmit load.

The charger dock LED has been blinking red for 20 minutes and won't switch to charging. The pack is seated correctly.

A blinking or fault LED on the Motorola CT-series dock usually means the pack voltage has dropped below the dock's acceptance threshold — common after extended storage. Remove the pack, wipe the gold contact strip with a dry cloth, and reseat firmly to clear any contact resistance. If the fault persists, the cells may need a recovery charge: some Motorola docks will not initiate a charge cycle below approximately 6.0V, and the pack may need to be conditioned first with a compatible Ni-MH charger that has a recovery or trickle mode.

The radio is running at noticeably lower TX power toward the end of a shift, even with bars still showing on the indicator.

This is voltage sag under sustained RF output — as the Ni-MH cells discharge, internal resistance rises and voltage drops under transmit load, causing the radio's power amplifier to back off output. The bar indicator is measuring resting voltage, not load voltage, so it can still show two bars while the radio is already sagging under transmit draw. Recharge the pack at the mid-shift break rather than waiting for the low-battery alert, and the radio will maintain consistent TX power through the second half of the shift.

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